Deuteronomy 33:8,10
And of Levi he said, Let your Thummim and your Urim be with your holy one, whom you did prove at Massah, and with whom you did strive at the waters of Meribah;
Torrey's Topical Textbook—AKJV

Malachi 2:7
For the priest's lips should keep knowledge, and they should seek the law at his mouth: for he is the messenger of the LORD of hosts.
Torrey's Topical Textbook—AKJV